This is a survey talk. We will discuss existence,
bending, and inflation of polyhedra in R^n. We will mainly
will focus on polyhedral 2-submanifolds in R^3. The results
belong to many geometers, including D. Bleecker, R. Connelly,
I. Sabitov, I. Pak, G. Perelman, V. Zalgaller, and myself.